Improvement in saw-frames



saw and E l the strainiiw-rod. 7 C* BEAUMAN BUTLER AND CHARLES F.RAMSAY, OF ST. JOHNSBURY, VERMONT.

Letters Patent No. 83,131, dated, OctoberI zo, moo.

IMIPROVEMENT IN SAW-FRAMES.

The Schedule referred to in these Letters Patent and making pm of thesama.

To all 'whom it may concerny Bc it known that we, BEAUMAN BUTLER andCHARLES F. Ramsar, both ot' St. J ohnsbury, in the county oi(lah-idonia, and State oi' if'erinont, have invented a new and usefulImprovement in Saw-Frames g and we do hereby declare the following to bea full, clear, and exact description of the saine, reference being hadto the accompanying drawings, which are made part of this speciication,and in which- Figure l is a sidc elevation of a saw-frame illustratingour invention.

Figure 2 is a longitudinal section oi' a part oi' the iranic, on theplane indicated h v the line .fr-x.

The subject oi' our invention is a saw-frame, made rigid at one end, andpivoted at the other end, for the purpose oi` stretching the saw, andprovided, at any proper point, with an elastic cushion, adapted topreserve the saw and frame from sudden strain, as hereinafter explained.

A B represent the two cross-pieces ot' the frame, one of which isprovided with theI customary handle, a, and, iil desired, with anadditional handle, c'.

il represents the cross-bar or fulcruni-picce, D thc The saidstrainingrod is bolted,at its centre, to the cross-piece C, and sec-inedto thel projecting part A oi' the upper end piece. A' C l1] will thus beseenv to constitute a triangular brace, by which the handle-end oi' theframe is made perfectly rigid.

The free end, E', of the straining-rod is screwthreaded, and, passingthrough the extremity of the lower end piece B, receives a hand-nut, F,working upon a suitable washer, j, and employed to stretch the saw.

We prefer to interpose a cushion, G, of caoutchouc, or a spring of anysuitable material, between the end piece B and the lower end of thecross-bar C, and to connect the said end piece and cross-bar by a bolt,H, in one of them, passing through slots in ears I I, secured to theother.

By this arrangement, we are enabled to keep a conl stant tension on thesaw, and avoid sudden or violent strain on any of the parts While inuse.

The cushion may, if preferred, be applied at the other end of .thecross-bar C, or, as at G', under the washer f, upon which the nut Fworks; or, the saw may be connected to either of the end pieces by boxesworking in slots, and supported by springs in opposition to the strainof the saw; or, when preferred, the elastic cushion or cushions may beapplied to the comn mon forms of frames by employing, in addition to theOrdinary straining-rod, a rod similar to E, applied at either end of theframe, and having a cushion or spring at either or both ends, arrangedin opposition to the strain of the saw.

The following may be named as advantages of our invention First. Rigidlybracing one end ofthe frame prevents it from becoming loose in thejoints, and yielding cornerwise, as frames of common construction areliable to do.

Second. The elastic bearing gives thc saw, while strained for use, adegree of flexibility or elasticity that at once causes it to workbetter, and renders it less liable to bend or break.

Third. By reason of the elasticity of the parts, the straining-nut willlast much longer, and will more freely come into position, (lengthwiseof the end piece, on which it bears,) under dierent degrees of tension,with less liability to break the flame.

The entire arrangement makes our frame at once simple and durable, andnot liable to .get out of order in inexperienced hands.

Having thus described our invention,

The following is what we claiih as new therein, and desire to secure byLetters Patent:

1. The saw-t`rame, constructed substantially as above described, with arigid end, A A C E, and a flexible end, B O E'.

2. The provision, in a buck-saw irame, of the spring or cushion, G G',substantially as and for the purposes'et forth. v i

3. The slotted'ears I I, or their equivalent, employed to connect thecross-bar and'end piece, and vpermit mutual play between them,substantially as described.

BEAUMAN BUTLER. CHARLES F. RAMSAY. Witnesses:

SIAS RANDALL, N; M. JOHNSON.

